Method and device for transmitting and receiving wireless signal in wireless communication system

Abstract

The resent invention relates to a wireless communication system, and particularly to a method and device for same, the method including the steps of: receiving, from a base station, L1 information about M number of UCells (M≤N) on which downlink resources are temporarily configured, wherein M number of UCells (M≤N) are a subset of N number of UCells; selectively aggregating K number of UCells (K<M) from among N number of UCells depending on a terminal's cell aggregation capability; and communicating with the base station by using the aggregated K number of UCells.

What is claimed is: 
     
       1. A method of performing communication by a user equipment (UE) in a wireless communication system, the method comprising:
 receiving first layer 1 (L1) information related to M (M≤N) number of unlicensed band cells (UCells) to which a downlink resource is temporarily set among N number of UCells from an eNB; 
 receiving second L1 information related to a maximum number of K of UCells that the UE is able to aggregate; 
 aggregating all of the M number of UCells, when K is no less than M; 
 aggregating K number of UCells selected by the UE from the N number of UCells based on a predetermined rule, without an indication from the eNB related to the selected K number of UCells, when K is less than M; and 
 performing communication with the eNB using the aggregated UCells. 
 
     
     
       2. The method of  claim 1 , wherein the K number of UCells are selected from the M number of UCells as follows:
 a UCell having a lower cell index is preferentially selected, 
 a UCell having a wider system bandwidth is preferentially selected, and 
 a UCell having a longer downlink resource is preferentially selected. 
 
     
     
       3. The method of  claim 1 , wherein the first and second L1 information are received on a PDCCH (physical downlink control channel). 
     
     
       4. The method of  claim 3 , wherein the second L1 information is received on an LCell (licensed band cell), and
 wherein the wireless communication system corresponds to a 3GPP (3rd generation partnership project) wireless communication system. 
 
     
     
       5. A user equipment (UE) configured to perform communication in a wireless communication system, the UE comprising:
 a transceiver; and 
 a processor configured to: 
 receive first layer 1 (L1) information related to M (M≤N) number of unlicensed band cells (UCells) to which a downlink resource is temporarily set among N number of UCells from an eNB, 
 receive second L1 information related to a maximum number K of UCells that the UE is able to aggregate, 
 aggregate all of the M number of UCells, when K is no less than M, 
 aggregate K number of UCells selected by the UE from the N number of UCells based on a predetermined rule, without an indication from the eNB related to the selected K number of UCells, when K is less than M, and 
 perform communication with the eNB using the aggregated UCells. 
 
     
     
       6. The user equipment of  claim 5 , wherein the K number of UCells are selected from the M number of UCells as follows:
 a UCell having a lower cell index is preferentially selected, 
 a UCell having a wider system bandwidth is preferentially selected, and 
 a UCell having a longer downlink resource is preferentially selected. 
 
     
     
       7. The user equipment of  claim 5 , wherein the first and second L1 information are received on a PDCCH (physical downlink control channel). 
     
     
       8. The user equipment of  claim 7 , wherein the second L1 information is received on an LCell (licensed band cell), and
 wherein the wireless communication system corresponds to a 3GPP (3rd generation partnership project) wireless communication system.